28231857 has 12 divisors (see below), whose sum is σ = 41388880. Its totient is φ = 18539928.

The previous prime is 28231831. The next prime is 28231867. The reversal of 28231857 is 75813282.

It is not a de Polignac number, because 28231857 - 2¹² = 28227761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28231817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22807 + ... + 24012.

Almost surely, 2^28231857 is an apocalyptic number.

It is an amenable number.

28231857 is a deficient number, since it is larger than the sum of its proper divisors (13157023).

28231857 is a wasteful number, since it uses less digits than its factorization.

28231857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46892 (or 46889 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 28231857 is about 5313.3658823763. The cubic root of 28231857 is about 304.4947542918.

The spelling of 28231857 in words is "twenty-eight million, two hundred thirty-one thousand, eight hundred fifty-seven".